People can grow trees. You need a lot more to make one of those contraptions. Hard to control people when they can just grow a plant to do what they need.
People tend to forget that trees have roots.
Roots cause problems with infrastructure.
Hence why when a problem arises you try to "get to the root of it".
Local ordinances specify minimum space requirements for trees, which may mean that they’re not allowed to be put in certain places. Also, they can cause pedestrian safety issues, as well as Ada compliance problems in confined spaces. This is an easy way to get something green in a place where you would otherwise not see a tree because of a lot of beaurocratic bullshit.
Obviously, you can argue that all that needs to be changed. And you’d be right. And in many places it’s moving that way. But then you also wouldn’t get anything done for quite some time. This is an option where there might be no other viable options at the moment.
Trees and algae have different utilities. Trees are beautiful, reduce temperature, offer shade, and produce a modest amount of oxygen. Algae tanks produce vastly more oxygen by volume and cause you to question whether it’s really enough to continue meandering through life in this stone and metal postmodern hellscape and maybe it’s okay to finally indulge in a vacation near open fields and untamed wilderness. The local camping spots might be available in a few weeks if my sanity can hold out. One doesn’t completely substitute the other.
This doesn’t have a root system to worry about so it needs less underground space. Don’t get me wrong I love me a good tree, but in places where there isn’t enough land for roots to spread this could be useful. Lots of side walk trees die due to not enough space for the roots
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